29 inline const QString toString (
const QDateTime& date_time, Opl::Datetime::DateTimeFormat format) {
 
   31     case Opl::Datetime::Default:
 
   32         return date_time.toString(Qt::ISODate);
 
   33     case Opl::Datetime::Backup:
 
   34         return date_time.toString(QStringLiteral(
"yyyy_MM_dd_T_hh_mm"));
 
   40 inline QDateTime fromString(
const QString& date_time_string)
 
   42     auto date_time = QDateTime::fromString(date_time_string, QStringLiteral(
"yyyy-MM-ddhh:mm"));
 
   43     date_time.setTimeZone(QTimeZone::utc());